South Dakota's DUNE Project — Kiewit-Alberici Preps Former Goldmine for Science Experiment
International science came to the Black Hills of western South Dakota, because that's where the deep hole is. Over the last century, the hole – Ross Shaft – was sunk 5,000 ft. to give access to lateral tunnels from which gold was extracted from sedimentary rock to a depth of 8,000 ft....
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via Inchiriere buldozere - Tuscher & Milas Company
from RSSMix.com Mix ID 8246474 https://ift.tt/2Nnj9yz
via Inchiriere buldozere - Tuscher & Milas Company
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